Circuit-continuing device



June 2, 1925v 1,540,112

H. A. DOUGLAS CIRCUITv CONTINUING DEVICE Filed Jan. 27. 19.2;

3 Sheets-Sheet l.

June 2, 1925- 1,540,112 H. A. DoUGlTAs CIRCUIT CONTINUIG DEVICE `Filed Jan. 27. 1921 s sheets-sheet 2 June 2, 1925.

H. A. DO UGLAs CIRCUIT CNTINQINCT DEVICE Filed Jan. 27, 1.9 2'1 s sheets-sheet Patented June 2, 1925.

UNITED STATES PATENT OFFICE.

HARRY DOUGLAS, OFBRONSON, MICHIGAN.

Cracow-CONTINUING DEvIoE.

Application led January 27, 1921. Serial No. 440,481.

To all whom t may concern.'

Be it known that I, HARRY A.. DOUGLAS, citizen of the United States, residing at Bronson, in the county of Branch and State of Michigan, have invented a certain new and useful Improvement in Circuit-Continuing Devices, of which the'following is a full, clear, concise, and exact description. My invention relates to circuit continuing devices such, for example, as are found in automobile headlight construction and has for its gene-ral object the provision of improved means for effecting the assembly between contact carriers and their supports. In the case of headlights, the invention embraces improved means for effecting the assembly between the mirror or back of a headlight and a contact carrying socket designed either for holding an incandescent lamp bulb or for holding a circuit continuing plug that is employed to include the lamp in circuit.

As I have practiced my invention the support for the contact carrier limits the longitudinal movement of the carrier in one direction anud a spring maintains the support and carrier in assembly and yieldingly limits the longitudinal movement of the carrier in an opposite direction.

The contact carrier, by means of my invention, is thus separably assembled with a support by means of the spring that maintains its assembly with such support, the device of my invention being thus broadly distinguished from those structures employing springs for maintaining the holders of incandescent lamp bulbs in assembly with supports with which are complemental to the lamps are also assembled but by means of threaded connections rather than springs.

I will explain my invention `more fully b v reference to the accompanying drawings showing preferred embodiments thereof and in which Fig. 1 is a view insection, partially in elevation, showin enough of a headlightto illustrate the adaptation of my invention thereto; Fig. 2 is an enlarged sectional view of a part of the structure as it appears in Fig. 1; Fig. 8 is a sectional View on line 3-3 of Fig. 1; Fig. 4 is a sectional view on line 4-4 of Fig. 1; Fig. 5 is a View in elevation of the auxiliary incandescent lamp illustrated in Fig. 1 with elements of my invention associated therewith illustrated in section; Fig. 6 is ai contact carriers that view on line 6-6 ofFig. 5; Fi 7 is a perspective view of parts illustrate in Figs. 5 and 6 in separated relation; Fig. 8 is a perspective view of parts found at the axis of the lamp and at the rear thereof in separated relation; Fig. 9 illustrates, in section, a modification that may be employed; Fig. 10 is a sectional view on line 10-10 of Fig. 9; Fig. 11 is a perspective view illustrating the parts shown in Figs. 9 and 10 in separated relation; Fig. 12 is a view in elevation, partially in section, showing. another modification; and Fig. 13 is a perspective viewrof the parts shown in Fig. 12 in separated relation.

Like parts are indicated by similar characters of reference throughout the different figures.

lThe headlight, that is partially illustrated, includes the back 1 and the reector 2 spaced apart from the back. Referring more particularly to Figs. 1, 2, 5, 6 and 7 ing shoulders 9 and 10 formed thereon in which the disc 7 is Y. received. The coiled 'spring 11 is received within the spring barrel tom portion 13 of the spring barrel and`` the flange portion 14 of the sleeve so that forward spring pressure is exerted upon the sleeve 12. The circuit conductor 15 is projected through the forward end of the sleeve 12, a button of solder 16 or other current conducting material being employed to mechanically and electrically unite such conductor and sleeve. It is preferred to maintain the insulating serving 17 about the wire 15 throughout the major portion of the bore of the sleeve 12 that preferably snugly engages the serving. The shell 5, forming a part of the contact carrier that is assembled with the supporting mirror 2 in a manl to this characteristic) a spring barrel 8 hav- Y ner to be described, is designed to receive another contact carrier 18, in this instance the base of an auxiliary incandescent lamp 19. This lamp .base is equipped with the usual bayonet pins 2O that are receivable within the bayonet slots or channels 4, these bayonet pins engaging other seats in saidr .in the particular embodiment of the invention illust-rated but to'which grounding the invention is not to be limited. The

spring 11 not only serves to effect and maintain the auxiliary incandescent lamp 19 in circuit but also serves to maintain the mechanical assembly of this lamp with the socket that receives its base.

'In assembling the parts the shell 5 is passed through acentral circular opening in the spring plate 22.

I then pass the shell 5 into an opening in the refiector 2 and then manipulate the shell so that it will have bayonet projection and channel engagement 3, 4 with the reflector. When such engagement has been effected the springplate 22, `which is desirably of dish or bowed form, is made flatter to cause it to exert outward spring pressure upon the shoulder 6 and inward spring pressure upon t-he reflector2 whereby the bayonet projection and channel engagement 3, 4 is maintained.

The plugging in device by which the lamp is included in circuit includes a Contact carrier in the form of a support into whose construction a metallic shell 23 enters. This shell is provided with bayonet channels 24 that are analogous in purpose to the bayonet channels 4, the innermost ends of the bayonet channels 24 receiving the bayonet projections 25 that are formed in the back 1 of the lamp and which are upon the margins of the opening through which the shell 23 is outwardly passed in the process of its assembly with the back. The shell 23 is also provided with a shoulder 26 that is analogous to the shoulder 6 of the shell 5, this shoulder being engaged by a spring plate 27 which is interposed between the shoulder and the inner face of the back 1 for the purpose of maintaining the shell 23 in its bayonet projection `and channel connection with the back 1, the

` pla-te 27 thus performing afunctionsimilarto the platev 22. There are two spring pressed contacts 28, 29 carried by the contact carrier 23, these contacts being respectively engageable with the contacts 30 and 31 upon the inner end face of the contacting plug 32. The spring pressed contacts 28 and 29 serve to maintain the plug 32 in assembly with the shell 23as well as to include the auxiliary incandescent lamp 19 Aand the main incandescent lamp 33 in circuit, 'the illustrated circuit paths followed by the current passing through the lamps being well understood by those skilled in the art. The incandescent lamp 33 may be adjusted axially of the reflector and when this adjustment is afforded the lamp holder 34 may be provided with slots`35 that engage tongues 36 formed upon the reflector so that the lamp holder will not turn as the bulb is being axially adj usted, as by means of the screw device 37.

I will now describe the modification of the invention illustrated in Figs. 9, 10 and 11 which show another arrangement for assembling the carrier for the auxiliary incandescent lamp with the lamp reflector 2. In this modified construction the shell 38 is provided with an annular shoulder 39 at its midportion that is engageable with the exterior of the reflector 2. The spring plate 40 is desirably of dish form and carries insetting bayonet projections 41 that are receiva'ble within the bayonet channels 42 formed in the shell 38, these bayonet p-ro` jections joining their seats at the inner ends of said channels. In assembling the parts of the structure yshown in Figs. 9 to 11, in-

elusive, the vshell 38 is inserted through the 9 refiector 2 from the back of the reflector and untll the shoulder 39 engages the reflector, whereafter the spring 40 is manipulated to bring the bayonet projectionsu 41 into the bayonet channels 42 and ultimately to the rear ends of such channels in which latter position of the bayonet projections 41 the spring plate 40 has been adjusted to exert sufficient spring tension to maintain the shoulder 39 in firm engagement with the rear face of the reflector 2. The other parts of the structure shown in Figs. 9 to 11 that are similar to structural parts hitherto specifically described will be given characters of' reference similar to the characters of reference applied to such other parts.

The construction shown in Figs. 12 and 13 is in several respects similar to the construction previously described for supporting the auxiliary incandescent lamp 19 in place with Vthe difference that in the structure of Figs. 12 and 13 the shell 43, instead of having bayonet projectionk and .channel connection with the refiector, is caused'to have engagement with the reflector by means of tongues 44 'struck obliquely from the shell 43 into engagement with the shoulder 45 formed upon the reflector. In the process of assembling' the parts of the structure shown in Figs. 12 rmd 13a spring p1ate22 is placed '.'a,f ;ainst the shoulder 6 andthe shell l43 is WhileI have herein4 shown and par-' "departing from the spirit of my invention, but having thus described my invention I claim as new and desire to secure by Letters vPatent the following 1. The combination with a contact carrier having an external shoulder; of a support in bayonet projection and channel connection vwith the contact carrier; and a bowed spring plate having an opening through which' the contact carrier is passed, the opening being of a. size to enable the portion "of the plate margining `it to enga-ge said' shoulder, said bayonet /projection and channel connection between the Contact carrier Land support 1,

2. The combination wlth a -contact carrier havingv an external-shoulder; of a support,

said carrier and support having means for 25'.

effecting their assembly; and a bowed spring plate having an opening through which the Contact carrier is passed, the opening being.5

of a size to enable the portion of the plate margimng 1t to engage sald shoulder, saidV 30 yassembly effecting means serving to draw said shoulder against said spring vplate and A to press the spring' plate against said Sup.- port. 'Y

In witness whereof, I hereunto subscribe 35 my name this 12thd day of November, A, D. 1920. A

HARRYA. DUGLAS.. 

